Scrubbing the gene pool.

[Kobal2fr]

Possibly an oversight more than a decision. They changed it back in RTW, caused a big outcry back then too.

But in M2TW the effects of XP have been toned down a lot, so it evens out in the end I suppose - MTW ragtag bands of old time experts at not dying were mondo powerfull but superhard to train, M2TW veteran units are easier to wind up with yet are not wargods.
Frankly, I don't think it's that wrong. Using veterans as training instructors, or having grizzled old vets teach the new guys a thing or two before they taste carnage for the first time, sort of thing ? Of course, you could always train new units to mix with the old ones instead of retraining the old ones, then retrain the depleted green unit, if you're OUTRAGED by the way CA DUMBED THE GAME DOWN and all that.

(damn, you're Didz, not Puzz3D. Forget that last part then )